CN100424474C - Externally-connected inductive flow sensor - Google Patents
Externally-connected inductive flow sensor Download PDFInfo
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- CN100424474C CN100424474C CNB2005100619402A CN200510061940A CN100424474C CN 100424474 C CN100424474 C CN 100424474C CN B2005100619402 A CNB2005100619402 A CN B2005100619402A CN 200510061940 A CN200510061940 A CN 200510061940A CN 100424474 C CN100424474 C CN 100424474C
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Abstract
A flow rate transducer of external link induction type is prepared as setting a numbers of detection units at bottom surface of structure body, setting through-hole on detection unit in the same direction as direction of fluid-flowing, arranging electrode plate at middle of piezoelectric ceramic plate and connecting electrode plate to lead wire, setting gap between wall of through-hole and internal core formed by piezoelectric plate and electrode plate and packing insulation plate in said gap.
Description
Technical field
The present invention relates to a kind of flow sensor, relate in particular to a kind of externally-connected inductive flow sensor that utilizes differential principle to measure the vortex street alternating pressure.
Background technology
Vortex flow sensors is a kind of novel flow measurement instrument that grows up the seventies in 20th century, and they detect the fluid oscillation frequency signal that is directly proportional with volumetric flow rate by the flow sensor of detection modes such as temperature-sensitive, strain, electric capacity, ultrasound wave.For vortex flow sensors, resistance to shock is an important indicator weighing a vortex shedding flow meter commercial Application quality.Vibration in the industry is ubiquitous, for example velocity fluctuation, fluid oscillating under the fluid turbulence state, and enchancement factors such as industrial pipeline vibration, valve opening and closing and valve core vibration, and this all can make detected frequency signal be subjected to great noise.Advanced both at home and abroad at present vortex flow sensors all has certain anti-vibration ability.But the detecting element of these sensors all is fixed on the tube wall, resists the limited in one's ability of pipe vibration, mostly is the induction rod form, and poor for different pipe diameter versatilities.In addition for the interference of fluid oscillation, in the time of the direction of vibration parallel (i.e. vibration in the same way) of the direction of vibration of vibration noise and institute measured frequency signal, the antijamming capability of these flow sensors is all more weak, and output signal can be sneaked into a large amount of noises.This phenomenon is especially obvious when low discharge is measured.For this reason, also the someone has applied for patent: " floated " from vibration damping difference current quantity sensor (ZL03228293.1), it comprises that symmetry is fixed on the detecting unit on dull and stereotyped two sides, each detecting unit comprises housing, housing has the through hole with the panel axes line parallel, this through hole has passage to communicate with the axial wire hole of flat board, the flexible diaphragm seal respectively of the two ends of through hole, two piezoelectric ceramic pieces are arranged in the through hole, one end of two piezoelectric ceramic pieces is fixed with flexible sheet respectively, the other end and the derby that is located between the piezoelectric ceramic piece are fixed, leave the gap between the periphery of two piezoelectric ceramic pieces and derby and the through-hole wall, the lead-in wire of derby is drawn from dull and stereotyped wire hole through passage.Floated is that flat board is goed deep in the pipeline from vibration damping difference current quantity sensor, place the back of bluff body, and the placement of detecting unit is perpendicular to the axis of pipeline.This result's flow sensor is owing to be deep into flat board in the pipeline, so its versatility is bad, when pipe diameter changes, just can not use, simultaneously, detecting unit is vertically placed, and is unfavorable for the collection of signal, for accurate inadequately in the measurement of low discharge, be easy to generate and sneak into a large amount of noises.
Summary of the invention
The invention provides a kind of simple and reasonablely, versatility is good, the highly sensitive externally-connected inductive flow sensor of measurement; Solved the output signal that exists in the prior art and sneaked into a large amount of noises, the technical matters that versatility is bad.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals: a kind of externally-connected inductive flow sensor, comprise a structural body and the detecting unit of being located on the structural body bottom surface, described structural body is provided with wire hole, is provided with lead-in wire in the wire hole; Described detecting unit comprises housing, be provided with through hole in the housing, the two ends of through hole are provided with flexible sheet, flexible sheet is close to piezoelectric ceramic piece, described detecting unit has n, n is even number and n 〉=2, and detecting unit is located on the bottom surface of structural body, and the through hole direction on the detecting unit is consistent with fluid flow direction; Described piezoelectric ceramic piece middle part is provided with electrode slice, is connecting on the electrode slice to go between, and lead-in wire is drawn by the hole occurring; Be provided with the gap between described inner core that constitutes by piezoelectric ceramic piece, electrode slice and through-hole wall, be filled with insulating trip in the gap.Structural body is arranged in the duct wall, by perforate on pipeline, makes the flexible sheet of structural body bottom surface can sense the vibration of eddy current, thereby will produce signal.It is located in the duct wall, and making can both be general corresponding to different pipe diameters.The direction that the opening direction of the through hole in the detecting unit flows along fluid, the sensitive surface that the axis direction of pipeline just, two flexible sheets constitute is horizontally disposed, help the collection of signal, and stability is also better.
As preferably, fluid flow direction is provided with dividing plate in the upper edge, bottom surface of structural body, and the detecting unit branch is listed in the both sides of dividing plate, and each side longshore current body flow direction is set side by side with m detecting unit, and n is the integral multiple of m.Detecting unit is fixed by being welded on bottom surface and the dividing plate, and the m of the both sides of a dividing plate detecting unit is in one line, and the number of m can be 1,2,3 ..., all detecting units all are positioned on the bottom surface, and flexible sheet just is welded on the left side of through hole.Being provided with of this kind structure could utilize differential principle, and the identical signal of end draws correct conclusion about counteracting.Flexible sheet is arranged on the different detecting units, thereby could utilizes differential principle, so the number of detecting unit must be 2n.
As preferably, longshore current body flow direction is provided with dividing plate in the bottom surface of described structural body, and the both sides of dividing plate are fixed with m respectively to detecting unit, and m is set up in parallel on the bottom surface of structural body the detecting unit level, and n is the integral multiple of m.Detecting unit is fixed by being welded on bottom surface and the dividing plate, the m of the both sides of dividing plate is in one line to detecting unit, the number of m can be 1,2,3 ..., all detecting units all are positioned on the bottom surface, and the height of dividing plate and the width of detecting unit equate or are slightly larger than the width of detecting unit, the one side m in one line of dividing plate is to detecting unit, and the length of dividing plate is greater than the total length of m to detecting unit at this moment.
As preferably, longshore current body flow direction is provided with dividing plate in the bottom surface of described structural body, and the both sides of dividing plate are fixed with m respectively to detecting unit, and m vertically is set up in parallel detecting unit, and n is the integral multiple of m.The height of dividing plate is greater than m times of the width of detecting unit, and the side at dividing plate vertically is welded with m to detecting unit like this, and the length of dividing plate is slightly larger than the total length of a pair of detecting unit.
As preferably, the number n of described detecting unit is 2, and m is 1.Be made of four detecting units, cost is relatively low, makes simply, and effect is also good.
The other end of through hole can directly seal, and the pre-tightening apparatus sealing also can be set.As preferably, the other end of through hole is provided with metal pretension piece, is threaded between metal pretension piece and housing, and piezoelectric ceramic piece is located between metal pretension piece and the flexible sheet.Flexible sheet is welded on an end of through hole, and the other end adopts metal pretension piece to tighten, and metal pretension piece can be the other end that is fixed on through hole by screw thread, and then welding is fixing.Adopted metal pretension piece to be convenient to assembling, and adopted pretension, made that piezoelectric ceramic piece is tightr to join with flexible sheet.
As preferably, the right-hand member of the detecting unit on the left side is provided with flexible sheet in a pair of detecting unit that is set up in parallel, and the left end of the detecting unit on the right is provided with flexible sheet.Leave certain space between two detecting units, the position that two flexible sheets are oppositely arranged is the inboard of two detecting units, metal like this
Fig. 4 is the side view of the application principle figure of externally-connected inductive flow sensor of the present invention.
Fig. 5 is the structural representation that the bulkhead sides of externally-connected inductive flow sensor of the present invention is provided with a plurality of detecting units.
Fig. 6 is the structural representation that the another kind of bulkhead sides of externally-connected inductive flow sensor of the present invention is provided with a plurality of detecting units.
Wherein, fluid flow direction is X.
The concrete example of implementing:
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment 1:
Shown in accompanying drawing 1,2,3 and 4, a kind of externally-connected inductive flow sensor, comprise a structural body 7 and two detecting units 5 being located on structural body 7 bottoms, structural body 7 places in pipeline 11 walls of sensor, pipeline 11 walls are provided with two pressure guide holes 12, detecting unit 5 is experienced the alterante stress of vortex generation body by pressure guide hole 12, and structural body 7 places in sensor pipeline 11 walls, makes that the versatility of sensor is better.The bottom surface of structural body 7 is provided with between 5, two detecting units 5 of two detecting units and is provided with dividing plate 10, and detecting unit 5 is cylindric, fixes on its bottom surface 13 by being welded on structural body 7 and the dividing plate 10.The height of dividing plate 10 is slightly larger than the diameter of detecting unit 5, the direction X that dividing plate 10 longshore current bodies flow, and the axis setting of pipeline 11 just, detecting unit 5 comprises housing 1 and inner core, is provided with through hole in the housing 1, the direction X that the opening direction of through hole flows along fluid.The both ends open place of through hole is welded with flexible sheet 2 respectively, in the seal cavity of 2 formation of two flexible sheets, order left-right symmetric according to " piezoelectric ceramic piece 3-electrode slice 8-collets 9 " is arranged, wherein flexible sheet 2 is close to piezoelectric ceramic piece 3, and flexible sheet 2, piezoelectric ceramic piece 3, electrode slice 8 and collets 9 all closely are connected in twos.Piezoelectric ceramic piece 3, electrode slice 8 and collets 9 constitute inner core, and the lead-in wire of two plate electrode sheets 8 is drawn through the wire hole 6 in the structural body 7.The size of these two piezoelectric ceramic pieces 3, quality and sensitivity coefficient are all identical.Be provided with the gap between piezoelectric ceramic piece 3, electrode slice 8 and collets 9 and through hole, in the gap, be filled with insulating trip 4.Whole detecting unit 5 is in horizontal direction in pipeline 11, be more conducive to the collection of signal like this.
Externally-connected inductive flow sensor B of the present invention is installed in vortex generation body A in the vortex shedding flow meter and goes up the position of general plan after partially, and dividing plate is parallel with the axis of vortex generation body.When a permanent current stabilization is flowed through vortex generation body, can produce vortex at its rear side, alternately send from both sides, form two row vortex street side by side, be called Karman vortex street.This vortex street can produce P1, P2 alternating pressure alternately, by pressure guide hole 12 P1, P2 alternating pressure is acted directly on the flexible sheet 2 of two detecting units 5 of this vortex flow sensors, makes piezoelectric ceramic piece 3 produce the alternation electric charges.At this moment four electrode slices 8 can be exported sinusoidal signal respectively, and establishing the left cell output signal is S1 and S1 ', and the right side is S2 and S2 ', and these four signals have following relation:
1. two of the dividing plate homonymy signal amplitudes and phase place all equate, i.e. S1=S1 ', S2=S2 ';
2. dividing plate not two groups of signal phases of homonymy differ 180 °;
3. the frequency of four signals equates.
These four signal Processing are become (S1+S1 ')-(S2+S2 ') by the rear end modulate circuit, utilize differential output just can obtain the sinusoidal signal of rule like this, even in low discharge, output signal is also stronger, has enlarged the range ability of flow sensor.
When fluid since stochastic factor such as pipe vibration, valve opening when fluid oscillating takes place, can cause flexible sheet 2 or sensor housing to produce and follow vibration.Since the inertia effect of detecting unit 5 built-in electrical insulation pieces 9, symmetrical two piezoelectric ceramic pieces, 3 meeting difference pressurized and tensions in the detecting unit 5, and this makes two piezoelectric ceramic pieces 3 produce the positive and negative charge signal that equates respectively, is assumed to be X1 (+) and X2 (-).When signal is synthetic, two signal plus X1+X2 of homonymy, the charge signal that disturbs vibration to be produced can be cancelled out each other, thus sensor has played from damping effect.
In addition, the fluid oscillation that causes for fluid pulsation, it is the plane wave that row are propagated along with flow direction in pipeline, the pressure that it causes acts on the detecting unit of flow sensor dividing plate both sides simultaneously with identical direction, belong to vibration interference in the same way, Zhen Dong undesired signal can be synthetic in output signal in the same way (S1+S1 ')-cancel out each other in (S2+S2 '), effectively like this eliminated the interference of fluid pulsation to detection signal.Therefore, externally-connected inductive flow sensor of the present invention has very high vibration resistance, is applicable to the flow measurement of fluids such as liquid, gas, steam.
Embodiment 2:
As shown in Figure 5, a kind of externally-connected inductive flow sensor, comprise a structural body 7 and the dividing plate of being located on structural body 7 bottom surfaces 13 10, the both sides of dividing plate 10 respectively are welded with two detecting units 5, two detecting units 5 are along pipeline 10 axis directions and be listed in a row, detecting unit 5 is cylindric, and the length of dividing plate 10 is greater than 2 times of the length of detecting unit 5, and the height of dividing plate 10 is identical with the diameter of detecting unit 5.All the other and embodiment 1 are together.
Embodiment 3:
As shown in Figure 6, a kind of externally-connected inductive flow sensor, comprise a structural body 7 and the dividing plate of being located on structural body 7 bottom surfaces 13 10, the both sides of dividing plate 10 respectively are welded with two detecting units 5, two detecting units 5 are arranged as row along pipeline 10 radial direction, detecting unit 5 is cylindric, and the height of dividing plate 10 is greater than 2 times of the diameter of detecting unit 5, all the other and embodiment 1 with.
Claims (10)
1. externally-connected inductive flow sensor comprises a structural body (7) and is located at detecting unit (5) on structural body (7) bottom surface (13) that structural body (7) is provided with wire hole (6); Wire hole is provided with lead-in wire in (6), described detecting unit (5) comprises housing (1), housing is provided with through hole in (1), the two ends of through hole are provided with flexible sheet (2), flexible sheet (2) is close to piezoelectric ceramic piece (3), it is characterized in that: described detecting unit (5) has n, and n is even number and n 〉=2, detecting unit (5) is located on the bottom surface (13) of structural body (7), and the through hole direction on the detecting unit (5) is consistent with the direction that fluid flows; Described piezoelectric ceramic piece (3) middle part is provided with electrode slice (8), is connecting on the electrode slice (8) to go between, and lead-in wire is drawn by wire hole (6); Be provided with the gap between described inner core that constitutes by piezoelectric ceramic piece (3), electrode slice (8) and through-hole wall, be filled with insulating trip (4) in the gap.
2. a kind of externally-connected inductive flow sensor according to claim 1, it is characterized in that: fluid flow direction is provided with dividing plate (10) in the upper edge, bottom surface (13) of structural body (7), detecting unit (5) divides the both sides that are listed in dividing plate (10), each side longshore current body flow direction is set side by side with m detecting unit (5), and n is the integral multiple of m.
3. a kind of externally-connected inductive flow sensor according to claim 1, it is characterized in that: fluid flow direction is provided with dividing plate (10) in the upper edge, bottom surface (13) of structural body (7), detecting unit (5) divides the both sides that are listed in dividing plate (10), each side vertically is set side by side with m detecting unit (5), and n is the integral multiple of m.
4. according to claim 1 or 2 or 3 described a kind of externally-connected inductive flow sensors, it is characterized in that: the number n of described detecting unit (5) is 2, and m is 1.
5. according to claim 1 or 2 or 3 described a kind of externally-connected inductive flow sensors, it is characterized in that: piezoelectric ceramic piece (3) middle part is provided with two electrode slices (8), is provided with collets (9) between two electrode slices (8).
6. a kind of externally-connected inductive flow sensor according to claim 4 is characterized in that: piezoelectric ceramic piece (3) middle part is provided with two electrode slices (8), is provided with collets (9) between two electrode slices (8)
7. according to claim 1 or 2 or 3 described a kind of externally-connected inductive flow sensors, it is characterized in that: described detecting unit (5) is a cylindrical shape, and size, quality and the sensitivity coefficient of the piezoelectric ceramic piece (3) in two detecting units (5) are all identical.
8. a kind of externally-connected inductive flow sensor according to claim 6 is characterized in that: described detecting unit (5) is a cylindrical shape, and size, quality and the sensitivity coefficient of the piezoelectric ceramic piece (3) in two detecting units (5) are all identical.
9. a kind of externally-connected inductive flow sensor according to claim 5 is characterized in that: collets (9) are ceramic block or mica block.
10. a kind of externally-connected inductive flow sensor according to claim 6 is characterized in that: collets (9) are ceramic block or mica block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100619402A CN100424474C (en) | 2005-12-12 | 2005-12-12 | Externally-connected inductive flow sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100619402A CN100424474C (en) | 2005-12-12 | 2005-12-12 | Externally-connected inductive flow sensor |
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| CN1982852A CN1982852A (en) | 2007-06-20 |
| CN100424474C true CN100424474C (en) | 2008-10-08 |
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| CNB2005100619402A Expired - Fee Related CN100424474C (en) | 2005-12-12 | 2005-12-12 | Externally-connected inductive flow sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699225B (en) * | 2009-10-26 | 2012-04-25 | 山东聊城科尔仪表科技有限公司 | Vortex street flow sensing and measuring method and special sensor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288230B (en) * | 2011-07-27 | 2012-12-05 | 江苏伟屹电子有限公司 | External stress vortex street sensor |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86104243A (en) * | 1985-06-20 | 1987-02-11 | 东机工株式会社 | Vortex flowmeter |
| CN1035559A (en) * | 1987-12-04 | 1989-09-13 | 施鲁博格工业公司 | Vortex flowmeter transducer |
| US4884458A (en) * | 1986-10-20 | 1989-12-05 | Lew Hyok S | High sensitivity vortex shedding flowmeter |
| US4911019A (en) * | 1986-10-30 | 1990-03-27 | Lew Hyok S | High sensitivity-high resonance frequency vortex shedding flowmeter |
| CN1053493A (en) * | 1991-02-11 | 1991-07-31 | 北京化工学院 | Mass flowmeter |
| JPH11201788A (en) * | 1998-01-19 | 1999-07-30 | Mitsubishi Electric Corp | Semi-conductor karman vortex flow rate sensor, and its manufacture |
| CN1275196A (en) * | 1998-08-12 | 2000-11-29 | 安德雷斯和霍瑟·弗罗泰克有限公司 | Turbulent flow sensor |
| JP2001349754A (en) * | 2000-06-07 | 2001-12-21 | Yokogawa Electric Corp | Karman vortex flowmeter |
| JP2003207378A (en) * | 2002-01-10 | 2003-07-25 | Yokogawa Electric Corp | Vortex flowmeter |
-
2005
- 2005-12-12 CN CNB2005100619402A patent/CN100424474C/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86104243A (en) * | 1985-06-20 | 1987-02-11 | 东机工株式会社 | Vortex flowmeter |
| US4884458A (en) * | 1986-10-20 | 1989-12-05 | Lew Hyok S | High sensitivity vortex shedding flowmeter |
| US4911019A (en) * | 1986-10-30 | 1990-03-27 | Lew Hyok S | High sensitivity-high resonance frequency vortex shedding flowmeter |
| CN1035559A (en) * | 1987-12-04 | 1989-09-13 | 施鲁博格工业公司 | Vortex flowmeter transducer |
| CN1053493A (en) * | 1991-02-11 | 1991-07-31 | 北京化工学院 | Mass flowmeter |
| JPH11201788A (en) * | 1998-01-19 | 1999-07-30 | Mitsubishi Electric Corp | Semi-conductor karman vortex flow rate sensor, and its manufacture |
| CN1275196A (en) * | 1998-08-12 | 2000-11-29 | 安德雷斯和霍瑟·弗罗泰克有限公司 | Turbulent flow sensor |
| JP2001349754A (en) * | 2000-06-07 | 2001-12-21 | Yokogawa Electric Corp | Karman vortex flowmeter |
| JP2003207378A (en) * | 2002-01-10 | 2003-07-25 | Yokogawa Electric Corp | Vortex flowmeter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699225B (en) * | 2009-10-26 | 2012-04-25 | 山东聊城科尔仪表科技有限公司 | Vortex street flow sensing and measuring method and special sensor |
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| CN1982852A (en) | 2007-06-20 |
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